Added error checking for samples.

docs/examples/anyauthput.c

@@ -162,6 +162,10 @@ int main(int argc, char **argv)
 
     /* Now run off and do what you've been told! */
     res = curl_easy_perform(curl);
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
 
     /* always cleanup */
     curl_easy_cleanup(curl);